Voltage surge protection device and method for PFC circuit in frequency conversion household appliances
A technology for home appliances and voltage swell, applied in emergency protection circuit devices, output power conversion devices, electrical components, etc. Improve reliability and user experience, avoid damage effects
Active Publication Date: 2018-07-13
GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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Problems solved by technology
However, for terminal power grids or distributed power grids, such as township and rural power grids, it is difficult for household appliances to work normally and stably due to unstable grid voltage and frequent disturbances, especially frequency conversion household appliances, which are prone to frequent start and stop conditions. Neither can save power, but also greatly affect the user's comfort and experience
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[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0032] A voltage surge protection device for a PFC circuit in a variable frequency household appliance and a voltage surge protection method for a PFC circuit in a variable frequency household appliance according to embodiments of the present invention will be described below with reference to the accompanying drawings.
[0033] figure 1 It is a schematic block diagram of a voltage surge protection device for a PFC circuit in a variable frequency household electrical appliance according to an embodiment of the present invention, ...
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The invention discloses an apparatus protecting a sudden voltage rise of a PFC circuit in a piece of frequency-conversion household equipment. The apparatus comprises a first voltage detection module used for detecting the input voltage of the PFC circuit; a current detection module used for detecting the input current of the PFC circuit; a second voltage detection module used for detecting the output voltage of the PFC circuit; and a protecting module generating a first comparison result, a second comparison result and a third comparison result according to the input voltage, the input current and the output voltage, respectively controlling the PFC circuit and a motor according to the first comparison result and the second comparison result and controlling the frequency-conversion household equipment to be power off and shut down according to the third comparison result. The protecting apparatus can guarantee continuous running with no shutdown when a voltage suddenly rises and the input current is less than a first current threshold value. The invention further discloses a method of protecting a sudden voltage rise of the PFC circuit in the frequency-conversion household equipment.
Description
technical field [0001] The present invention relates to the technical field of air-conditioning systems, in particular to a voltage surge protection device for a PFC (Power Factor Correction, power factor correction) circuit in frequency conversion household appliances and a voltage surge protection device for PFC circuits in frequency conversion household appliances method. Background technique [0002] Frequency conversion is gradually becoming the trend of home appliances, especially air conditioners, refrigerators and washing machines. The frequency conversion technology can greatly save the power consumption of home appliances, and has the advantages of low noise and high performance. [0003] Since the frequency conversion requires DC power supply, and the general city power is AC with a fixed voltage of 220V, it is necessary to convert the AC power into DC power through a rectifier circuit and a booster circuit to supply power to the load. In addition, in order to re...
Claims
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IPC IPC(8): H02H7/12H02M3/155
Inventor 盛爽
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD